Microcontroller Based Adjustable Speed Closed-Loop DC Motor Drive

The speed control of DC motors is very crucial especially in applications where precision and protection are of importance. This work investigates and implements a microcontroller-based adjustable speed drive system for a DC shunt motor. The theory of the armature voltage control algorithm in a c...

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Main Author:	S. Ettomi Ali, Yousef
Format:	Thesis
Language:	English
Published:	2004
Subjects:	Control theory Speed
Online Access:	http://psasir.upm.edu.my/id/eprint/243/1/549523_FK_2004_3.pdf
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id	my-upm-ir.243
record_format	uketd_dc
spelling	my-upm-ir.2432015-08-06T03:14:33Z Microcontroller Based Adjustable Speed Closed-Loop DC Motor Drive 2004-02 S. Ettomi Ali, Yousef The speed control of DC motors is very crucial especially in applications where precision and protection are of importance. This work investigates and implements a microcontroller-based adjustable speed drive system for a DC shunt motor. The theory of the armature voltage control algorithm in a closed loop system has been successfully implemented. An IGBT switch is used in buck configuration to control the armature voltage of the motor. The PWM signal that controls the IGBT is generated from a Motorola 68HC11 microcontroller. The speed of the motor is measured by a shaft encoder and directly fed to the microcontroller along with a speed reference signal.A data acquisition routine reads the measured speed and the reference speed in digital format and generates the error value signal. The error value signal is directly fed into the proportional controller routine to commute the controller output. Finally, the controller output is used to generate a PWM, which completes the loop by controlling the switch. To protect the motor from high current, a current monitoring routine is implemented to read the motor current through a Hall effect sensor. If the motor current is higher than its rated current halting the PWM generation routine will stop it. Experimental results obtained have supported the idea of the design. The speed of the motor could be controlled over a wide range using the dc chopper and the PWM. Employment of a microcontroller has shown a great improvement in the acceleration, speed reduction, and deceleration and over current protection of a dc motor. Control theory Speed 2004-02 Thesis http://psasir.upm.edu.my/id/eprint/243/ http://psasir.upm.edu.my/id/eprint/243/1/549523_FK_2004_3.pdf application/pdf en public masters Universiti Putra Malaysia Control theory Speed Faculty of Engineering
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Control theory Speed
spellingShingle	Control theory Speed S. Ettomi Ali, Yousef Microcontroller Based Adjustable Speed Closed-Loop DC Motor Drive
description	The speed control of DC motors is very crucial especially in applications where precision and protection are of importance. This work investigates and implements a microcontroller-based adjustable speed drive system for a DC shunt motor. The theory of the armature voltage control algorithm in a closed loop system has been successfully implemented. An IGBT switch is used in buck configuration to control the armature voltage of the motor. The PWM signal that controls the IGBT is generated from a Motorola 68HC11 microcontroller. The speed of the motor is measured by a shaft encoder and directly fed to the microcontroller along with a speed reference signal.A data acquisition routine reads the measured speed and the reference speed in digital format and generates the error value signal. The error value signal is directly fed into the proportional controller routine to commute the controller output. Finally, the controller output is used to generate a PWM, which completes the loop by controlling the switch. To protect the motor from high current, a current monitoring routine is implemented to read the motor current through a Hall effect sensor. If the motor current is higher than its rated current halting the PWM generation routine will stop it. Experimental results obtained have supported the idea of the design. The speed of the motor could be controlled over a wide range using the dc chopper and the PWM. Employment of a microcontroller has shown a great improvement in the acceleration, speed reduction, and deceleration and over current protection of a dc motor.
format	Thesis
qualification_level	Master's degree
author	S. Ettomi Ali, Yousef
author_facet	S. Ettomi Ali, Yousef
author_sort	S. Ettomi Ali, Yousef
title	Microcontroller Based Adjustable Speed Closed-Loop DC Motor Drive
title_short	Microcontroller Based Adjustable Speed Closed-Loop DC Motor Drive
title_full	Microcontroller Based Adjustable Speed Closed-Loop DC Motor Drive
title_fullStr	Microcontroller Based Adjustable Speed Closed-Loop DC Motor Drive
title_full_unstemmed	Microcontroller Based Adjustable Speed Closed-Loop DC Motor Drive
title_sort	microcontroller based adjustable speed closed-loop dc motor drive
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Engineering
publishDate	2004
url	http://psasir.upm.edu.my/id/eprint/243/1/549523_FK_2004_3.pdf
_version_	1747810182519324672

Microcontroller Based Adjustable Speed Closed-Loop DC Motor Drive

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